The only reason Bizmark is on premium food is that beef and chicken make him itch. He was on Kirkland food before this issue cropped up, and did really well. Now, he's on Nutrisource Seafood Select. He does fine with the occasional beef bone or chicken treat, it just can't be his everyday food. He's 11, and maintains his weight really well on 2 1/2 cups of food per day (he's a 60# bowling ball of a dog).
Casper, the puppy, is growing like a weed on Kirkland puppy formula. There's no reason to give her the more expensive stuff.